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Re: [Qemu-devel] vhost acceleration broken?

From: Rusty Russell
Subject: Re: [Qemu-devel] vhost acceleration broken?
Date: Thu, 25 Jul 2013 12:37:32 +0930
User-agent: Notmuch/0.15.2+81~gd2c8818 (http://notmuchmail.org) Emacs/23.4.1 (i686-pc-linux-gnu)

Anthony Liguori <address@hidden> writes:
> On Wed, Jul 24, 2013 at 8:55 PM, Rusty Russell <address@hidden> wrote:
>> Hi all,
>>         Using latest kernel and master qemu, the following doesn't use
>> vhost acceleration:
>> sudo qemu-system-x86_64 -machine pc,accel=kvm $ARGS -m 1024 -net 
>> tap,script=/home/rusty/bin/kvm-ifup,downscript=no,vhost=on -net 
>> nic,model=virtio -drive file=$QEMUIMAGE,index=0,media=disk,if=virtio -kernel 
>> arch/x86/boot/bzImage -append "root=/dev/vda1 $KARGS $*"
> sudo qemu-system-x86_64 -enable-kvm $ARGS -m 1G -netdev
> tap,script=/home/rusty/bin/kvm-ifup,vhost=on,id=net0 -device
> virtio-net-pci,netdev=net0 -drive file=$QEMUIMAGE,if=virtio -kernel
> arch/x86/boot/bzImage -append "root=/dev/vda1 $KARGS $*"
> We really ought to strongly deprecate -net because it's misleading.  I
> suspect we can reasonably add a warning for model=virtio saying
> "please don't use this" and eventually remove it entirely.

Thankyou, that works.

I'm sure you've thought more deeply about the qemu cmdline than I have,
so I won't comment.


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